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Helicity-Sensitive Plasmonic Terahertz Interferometer.

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|September 9, 2020
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Summary

Researchers developed a plasmonic interferometer using graphene field-effect transistors. This device shows helicity- and phase-sensitive conversion of light into voltage, enabling precise phase difference measurements.

Keywords:
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Area of Science:

  • Terahertz (THz) technology
  • Plasmonics
  • Condensed Matter Physics

Background:

  • Plasmonic interferometry is emerging for THz applications.
  • Graphene field-effect transistors (GFETs) offer unique electronic properties.

Purpose of the Study:

  • To explore a novel plasmonic interferometer based on GFETs.
  • To demonstrate helicity- and phase-sensitive signal conversion.

Main Methods:

  • Fabrication of a GFET-based plasmonic interferometer.
  • Utilizing specially designed asymmetric antennas.
  • Excitation and interference of plasmon waves within the GFET channel.

Main Results:

  • Observed helicity- and phase-sensitive conversion of circularly polarized radiation to DC photovoltage.
  • Demonstrated plasmon interference within the GFET channel.
  • Showcased a sign change in the DC signal upon helicity inversion.

Conclusions:

  • The plasmonic interferometer enables precise phase difference measurements.
  • The device facilitates phase-sensitive probing of 2D material plasma waves.
  • This work opens new avenues for THz plasmonic devices.